Stabilized high-order Galerkin methods based on a parameter-free dynamic SGS model for LES

Simone Marras, Murtazo Nazarov, Francis X. Giraldo

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The high order spectral element approximation of the Euler equations is stabilized via a dynamic sub-grid scale model (Dyn-SGS). This model was originally designed for linear finite elements to solve compressible flows at large Mach numbers. We extend its application to high-order spectral elements to solve the Euler equations of low Mach number stratified flows. The major justification of this work is twofold: stabilization and large eddy simulation are achieved via one scheme only.Because the diffusion coefficients of the regularization stresses obtained via Dyn-SGS are residual-based, the effect of the artificial diffusion is minimal in the regions where the solution is smooth. The direct consequence is that the nominal convergence rate of the high-order solution of smooth problems is not degraded. To our knowledge, this is the first application in atmospheric modeling of a spectral element model stabilized by an eddy viscosity scheme that, by construction, may fulfill stabilization requirements, can model turbulence via LES, and is completely free of a user-tunable parameter.From its derivation, it will be immediately clear that Dyn-SGS is independent of the numerical method; it could be implemented in a discontinuous Galerkin, finite volume, or other environments alike. Preliminary discontinuous Galerkin results are reported as well. The straightforward extension to non-linear scalar problems is also described. A suite of 1D, 2D, and 3D test cases is used to assess the method, with some comparison against the results obtained with the most known Lilly-Smagorinsky SGS model.

Original languageEnglish (US)
Pages (from-to)77-101
Number of pages25
JournalJournal of Computational Physics
Volume301
DOIs
StatePublished - Nov 15 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Numerical Analysis
  • Modeling and Simulation
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)
  • Computer Science Applications
  • Computational Mathematics
  • Applied Mathematics

Keywords

  • Adaptive dissipation
  • Discontinuous Galerkin
  • Dynamic SGS model
  • LES
  • Large eddy simulation
  • Localized artificial viscosity
  • Low Mach number
  • Non-hydrostatic atmospheric flows
  • Spectral element method
  • Stratified flows

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